// This file is part of Substrate.

// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! bounties pallet tests.

#![cfg(test)]

use crate as pallet_bounties;
use super::*;
use std::cell::RefCell;

use frame_support::{
	assert_noop, assert_ok, parameter_types, weights::Weight, traits::OnInitialize
};

use sp_core::H256;
use sp_runtime::{
	Perbill, ModuleId,
	testing::Header,
	traits::{BlakeTwo256, IdentityLookup, BadOrigin},
};

type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Test>;
type Block = frame_system::mocking::MockBlock<Test>;

frame_support::construct_runtime!(
	pub enum Test where
		Block = Block,
		NodeBlock = Block,
		UncheckedExtrinsic = UncheckedExtrinsic,
	{
		System: frame_system::{Module, Call, Config, Storage, Event<T>},
		Balances: pallet_balances::{Module, Call, Storage, Config<T>, Event<T>},
		Bounties: pallet_bounties::{Module, Call, Storage, Event<T>},
		Treasury: pallet_treasury::{Module, Call, Storage, Config, Event<T>},
	}
);

parameter_types! {
	pub const BlockHashCount: u64 = 250;
	pub const MaximumBlockWeight: Weight = 1024;
	pub const MaximumBlockLength: u32 = 2 * 1024;
	pub const AvailableBlockRatio: Perbill = Perbill::one();
}

impl frame_system::Config for Test {
	type BaseCallFilter = ();
	type BlockWeights = ();
	type BlockLength = ();
	type DbWeight = ();
	type Origin = Origin;
	type Index = u64;
	type BlockNumber = u64;
	type Call = Call;
	type Hash = H256;
	type Hashing = BlakeTwo256;
	type AccountId = u128; // u64 is not enough to hold bytes used to generate bounty account
	type Lookup = IdentityLookup<Self::AccountId>;
	type Header = Header;
	type Event = Event;
	type BlockHashCount = BlockHashCount;
	type Version = ();
	type PalletInfo = PalletInfo;
	type AccountData = pallet_balances::AccountData<u64>;
	type OnNewAccount = ();
	type OnKilledAccount = ();
	type SystemWeightInfo = ();
	type SS58Prefix = ();
}
parameter_types! {
	pub const ExistentialDeposit: u64 = 1;
}
impl pallet_balances::Config for Test {
	type MaxLocks = ();
	type Balance = u64;
	type Event = Event;
	type DustRemoval = ();
	type ExistentialDeposit = ExistentialDeposit;
	type AccountStore = System;
	type WeightInfo = ();
}
thread_local! {
	static TEN_TO_FOURTEEN: RefCell<Vec<u128>> = RefCell::new(vec![10,11,12,13,14]);
}
parameter_types! {
	pub const ProposalBond: Permill = Permill::from_percent(5);
	pub const ProposalBondMinimum: u64 = 1;
	pub const SpendPeriod: u64 = 2;
	pub const Burn: Permill = Permill::from_percent(50);
	pub const DataDepositPerByte: u64 = 1;
	pub const TreasuryModuleId: ModuleId = ModuleId(*b"py/trsry");
}
// impl pallet_treasury::Config for Test {
impl pallet_treasury::Config for Test {
	type ModuleId = TreasuryModuleId;
	type Currency = pallet_balances::Module<Test>;
	type ApproveOrigin = frame_system::EnsureRoot<u128>;
	type RejectOrigin = frame_system::EnsureRoot<u128>;
	type Event = Event;
	type OnSlash = ();
	type ProposalBond = ProposalBond;
	type ProposalBondMinimum = ProposalBondMinimum;
	type SpendPeriod = SpendPeriod;
	type Burn = Burn;
	type BurnDestination = ();  // Just gets burned.
	type WeightInfo = ();
	type SpendFunds = Bounties;
}
parameter_types! {
	pub const BountyDepositBase: u64 = 80;
	pub const BountyDepositPayoutDelay: u64 = 3;
	pub const BountyUpdatePeriod: u32 = 20;
	pub const BountyCuratorDeposit: Permill = Permill::from_percent(50);
	pub const BountyValueMinimum: u64 = 1;
	pub const MaximumReasonLength: u32 = 16384;
}
impl Config for Test {
	type Event = Event;
	type BountyDepositBase = BountyDepositBase;
	type BountyDepositPayoutDelay = BountyDepositPayoutDelay;
	type BountyUpdatePeriod = BountyUpdatePeriod;
	type BountyCuratorDeposit = BountyCuratorDeposit;
	type BountyValueMinimum = BountyValueMinimum;
	type DataDepositPerByte = DataDepositPerByte;
	type MaximumReasonLength = MaximumReasonLength;
	type WeightInfo = ();
}

type TreasuryError = pallet_treasury::Error::<Test, pallet_treasury::DefaultInstance>;

pub fn new_test_ext() -> sp_io::TestExternalities {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	pallet_balances::GenesisConfig::<Test>{
		// Total issuance will be 200 with treasury account initialized at ED.
		balances: vec![(0, 100), (1, 98), (2, 1)],
	}.assimilate_storage(&mut t).unwrap();
	pallet_treasury::GenesisConfig::default().assimilate_storage::<Test, _>(&mut t).unwrap();
	t.into()
}

fn last_event() -> RawEvent<u64, u128> {
	System::events().into_iter().map(|r| r.event)
		.filter_map(|e| {
			if let Event::pallet_bounties(inner) = e { Some(inner) } else { None }
		})
		.last()
		.unwrap()
}

#[test]
fn genesis_config_works() {
	new_test_ext().execute_with(|| {
		assert_eq!(Treasury::pot(), 0);
		assert_eq!(Treasury::proposal_count(), 0);
	});
}

#[test]
fn minting_works() {
	new_test_ext().execute_with(|| {
		// Check that accumulate works when we have Some value in Dummy already.
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);
	});
}

#[test]
fn spend_proposal_takes_min_deposit() {
	new_test_ext().execute_with(|| {
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 1, 3));
		assert_eq!(Balances::free_balance(0), 99);
		assert_eq!(Balances::reserved_balance(0), 1);
	});
}

#[test]
fn spend_proposal_takes_proportional_deposit() {
	new_test_ext().execute_with(|| {
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 5);
	});
}

#[test]
fn spend_proposal_fails_when_proposer_poor() {
	new_test_ext().execute_with(|| {
		assert_noop!(
			Treasury::propose_spend(Origin::signed(2), 100, 3),
			TreasuryError::InsufficientProposersBalance,
		);
	});
}

#[test]
fn accepted_spend_proposal_ignored_outside_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(1);
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Treasury::pot(), 100);
	});
}

#[test]
fn unused_pot_should_diminish() {
	new_test_ext().execute_with(|| {
		let init_total_issuance = Balances::total_issuance();
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Balances::total_issuance(), init_total_issuance + 100);

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 50);
		assert_eq!(Balances::total_issuance(), init_total_issuance + 50);
	});
}

#[test]
fn rejected_spend_proposal_ignored_on_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Treasury::pot(), 50);
	});
}

#[test]
fn reject_already_rejected_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));
		assert_noop!(Treasury::reject_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn reject_non_existent_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		assert_noop!(Treasury::reject_proposal(Origin::root(), 0),
		pallet_treasury::Error::<Test, pallet_treasury::DefaultInstance>::InvalidIndex);
	});
}

#[test]
fn accept_non_existent_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		assert_noop!(Treasury::approve_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn accept_already_rejected_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));
		assert_noop!(Treasury::approve_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn accepted_spend_proposal_enacted_on_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Balances::free_balance(3), 100);
		assert_eq!(Treasury::pot(), 0);
	});
}

#[test]
fn pot_underflow_should_not_diminish() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 150, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 100); // Pot hasn't changed

		let _ = Balances::deposit_into_existing(&Treasury::account_id(), 100).unwrap();
		<Treasury as OnInitialize<u64>>::on_initialize(4);
		assert_eq!(Balances::free_balance(3), 150); // Fund has been spent
		assert_eq!(Treasury::pot(), 25); // Pot has finally changed
	});
}

// Treasury account doesn't get deleted if amount approved to spend is all its free balance.
// i.e. pot should not include existential deposit needed for account survival.
#[test]
fn treasury_account_doesnt_get_deleted() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);
		let treasury_balance = Balances::free_balance(&Treasury::account_id());

		assert_ok!(Treasury::propose_spend(Origin::signed(0), treasury_balance, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 100); // Pot hasn't changed

		assert_ok!(Treasury::propose_spend(Origin::signed(0), Treasury::pot(), 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 1));

		<Treasury as OnInitialize<u64>>::on_initialize(4);
		assert_eq!(Treasury::pot(), 0); // Pot is emptied
		assert_eq!(Balances::free_balance(Treasury::account_id()), 1); // but the account is still there
	});
}

// In case treasury account is not existing then it works fine.
// This is useful for chain that will just update runtime.
#[test]
fn inexistent_account_works() {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	pallet_balances::GenesisConfig::<Test>{
		balances: vec![(0, 100), (1, 99), (2, 1)],
	}.assimilate_storage(&mut t).unwrap();
	// Treasury genesis config is not build thus treasury account does not exist
	let mut t: sp_io::TestExternalities = t.into();

	t.execute_with(|| {
		assert_eq!(Balances::free_balance(Treasury::account_id()), 0); // Account does not exist
		assert_eq!(Treasury::pot(), 0); // Pot is empty

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 99, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 1, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 1));
		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 0); // Pot hasn't changed
		assert_eq!(Balances::free_balance(3), 0); // Balance of `3` hasn't changed

		Balances::make_free_balance_be(&Treasury::account_id(), 100);
		assert_eq!(Treasury::pot(), 99); // Pot now contains funds
		assert_eq!(Balances::free_balance(Treasury::account_id()), 100); // Account does exist

		<Treasury as OnInitialize<u64>>::on_initialize(4);

		assert_eq!(Treasury::pot(), 0); // Pot has changed
		assert_eq!(Balances::free_balance(3), 99); // Balance of `3` has changed
	});
}

#[test]
fn propose_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 10, b"1234567890".to_vec()));

		assert_eq!(last_event(), RawEvent::BountyProposed(0));

		let deposit: u64 = 85 + 5;
		assert_eq!(Balances::reserved_balance(0), deposit);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 0,
			curator_deposit: 0,
			value: 10,
			bond: deposit,
			status: BountyStatus::Proposed,
		});

		assert_eq!(Bounties::bounty_descriptions(0).unwrap(), b"1234567890".to_vec());

		assert_eq!(Bounties::bounty_count(), 1);
	});
}

#[test]
fn propose_bounty_validation_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 0, [0; 17_000].to_vec()),
			Error::<Test>::ReasonTooBig
		);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 10, b"12345678901234567890".to_vec()),
			Error::<Test>::InsufficientProposersBalance
		);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 0, b"12345678901234567890".to_vec()),
			Error::<Test>::InvalidValue
		);
	});
}

#[test]
fn close_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::InvalidIndex);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 10, b"12345".to_vec()));

		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		let deposit: u64 = 80 + 5;

		assert_eq!(last_event(), RawEvent::BountyRejected(0, deposit));

		assert_eq!(Balances::reserved_balance(0), 0);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		assert_eq!(Bounties::bounties(0), None);
		assert!(!pallet_treasury::Proposals::<Test>::contains_key(0));

		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn approve_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_noop!(Bounties::approve_bounty(Origin::root(), 0), Error::<Test>::InvalidIndex);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		let deposit: u64 = 80 + 5;

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 0,
			value: 50,
			curator_deposit: 0,
			bond: deposit,
			status: BountyStatus::Approved,
		});
		assert_eq!(Bounties::bounty_approvals(), vec![0]);

		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::UnexpectedStatus);

		// deposit not returned yet
		assert_eq!(Balances::reserved_balance(0), deposit);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		<Treasury as OnInitialize<u64>>::on_initialize(2);

		// return deposit
		assert_eq!(Balances::reserved_balance(0), 0);
		assert_eq!(Balances::free_balance(0), 100);

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 0,
			curator_deposit: 0,
			value: 50,
			bond: deposit,
			status: BountyStatus::Funded,
		});

		assert_eq!(Treasury::pot(), 100 - 50 - 25); // burn 25
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 50);
	});
}

#[test]
fn assign_curator_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_noop!(Bounties::propose_curator(Origin::root(), 0, 4, 4), Error::<Test>::InvalidIndex);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_noop!(Bounties::propose_curator(Origin::root(), 0, 4, 50), Error::<Test>::InvalidFee);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 4,
			curator_deposit: 0,
			value: 50,
			bond: 85,
			status: BountyStatus::CuratorProposed {
				curator: 4,
			},
		});

		assert_noop!(Bounties::accept_curator(Origin::signed(1), 0), Error::<Test>::RequireCurator);
		assert_noop!(Bounties::accept_curator(Origin::signed(4), 0), pallet_balances::Error::<Test, _>::InsufficientBalance);

		Balances::make_free_balance_be(&4, 10);

		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 4,
			curator_deposit: 2,
			value: 50,
			bond: 85,
			status: BountyStatus::Active {
				curator: 4,
				update_due: 22,
			},
		});

		assert_eq!(Balances::free_balance(&4), 8);
		assert_eq!(Balances::reserved_balance(&4), 2);
	});
}

#[test]
fn unassign_curator_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		assert_noop!(Bounties::unassign_curator(Origin::signed(1), 0), BadOrigin);

		assert_ok!(Bounties::unassign_curator(Origin::signed(4), 0));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 4,
			curator_deposit: 0,
			value: 50,
			bond: 85,
			status: BountyStatus::Funded,
		});

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		Balances::make_free_balance_be(&4, 10);

		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_ok!(Bounties::unassign_curator(Origin::root(), 0));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 4,
			curator_deposit: 0,
			value: 50,
			bond: 85,
			status: BountyStatus::Funded,
		});

		assert_eq!(Balances::free_balance(&4), 8);
		assert_eq!(Balances::reserved_balance(&4), 0); // slashed 2
	});
}


#[test]
fn award_and_claim_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 10);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 8); // inital 10 - 2 deposit

		assert_noop!(Bounties::award_bounty(Origin::signed(1), 0, 3), Error::<Test>::RequireCurator);

		assert_ok!(Bounties::award_bounty(Origin::signed(4), 0, 3));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 4,
			curator_deposit: 2,
			value: 50,
			bond: 85,
			status: BountyStatus::PendingPayout {
				curator: 4,
				beneficiary: 3,
				unlock_at: 5
			},
		});

		assert_noop!(Bounties::claim_bounty(Origin::signed(1), 0), Error::<Test>::Premature);

		System::set_block_number(5);
		<Treasury as OnInitialize<u64>>::on_initialize(5);

		assert_ok!(Balances::transfer(Origin::signed(0), Bounties::bounty_account_id(0), 10));

		assert_ok!(Bounties::claim_bounty(Origin::signed(1), 0));

		assert_eq!(last_event(), RawEvent::BountyClaimed(0, 56, 3));

		assert_eq!(Balances::free_balance(4), 14); // initial 10 + fee 4

		assert_eq!(Balances::free_balance(3), 56);
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn claim_handles_high_fee() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 30);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 49));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_ok!(Bounties::award_bounty(Origin::signed(4), 0, 3));

		System::set_block_number(5);
		<Treasury as OnInitialize<u64>>::on_initialize(5);

		// make fee > balance
		let _ = Balances::slash(&Bounties::bounty_account_id(0), 10);

		assert_ok!(Bounties::claim_bounty(Origin::signed(1), 0));

		assert_eq!(last_event(), RawEvent::BountyClaimed(0, 0, 3));

		assert_eq!(Balances::free_balance(4), 70); // 30 + 50 - 10
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn cancel_and_refund() {
	new_test_ext().execute_with(|| {

		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Balances::transfer(Origin::signed(0), Bounties::bounty_account_id(0), 10));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 0,
			curator_deposit: 0,
			value: 50,
			bond: 85,
			status: BountyStatus::Funded,
		});

		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 60);

		assert_noop!(Bounties::close_bounty(Origin::signed(0), 0), BadOrigin);

		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		assert_eq!(Treasury::pot(), 85); // - 25 + 10

	});

}

#[test]
fn award_and_cancel() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 0, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(0), 0));

		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 5);

		assert_ok!(Bounties::award_bounty(Origin::signed(0), 0, 3));

		// Cannot close bounty directly when payout is happening...
		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::PendingPayout);

		// Instead unassign the curator to slash them and then close.
		assert_ok!(Bounties::unassign_curator(Origin::root(), 0));
		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		assert_eq!(last_event(), RawEvent::BountyCanceled(0));

		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		// Slashed.
		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn expire_and_unassign() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 1, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(1), 0));

		assert_eq!(Balances::free_balance(1), 93);
		assert_eq!(Balances::reserved_balance(1), 5);

		System::set_block_number(22);
		<Treasury as OnInitialize<u64>>::on_initialize(22);

		assert_noop!(Bounties::unassign_curator(Origin::signed(0), 0), Error::<Test>::Premature);

		System::set_block_number(23);
		<Treasury as OnInitialize<u64>>::on_initialize(23);

		assert_ok!(Bounties::unassign_curator(Origin::signed(0), 0));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 10,
			curator_deposit: 0,
			value: 50,
			bond: 85,
			status: BountyStatus::Funded,
		});

		assert_eq!(Balances::free_balance(1), 93);
		assert_eq!(Balances::reserved_balance(1), 0); // slashed

	});
}

#[test]
fn extend_expiry() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 10);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		assert_noop!(Bounties::extend_bounty_expiry(Origin::signed(1), 0, Vec::new()), Error::<Test>::UnexpectedStatus);

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 5);
		assert_eq!(Balances::reserved_balance(4), 5);

		System::set_block_number(10);
		<Treasury as OnInitialize<u64>>::on_initialize(10);

		assert_noop!(Bounties::extend_bounty_expiry(Origin::signed(0), 0, Vec::new()), Error::<Test>::RequireCurator);
		assert_ok!(Bounties::extend_bounty_expiry(Origin::signed(4), 0, Vec::new()));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 10,
			curator_deposit: 5,
			value: 50,
			bond: 85,
			status: BountyStatus::Active { curator: 4, update_due: 30 },
		});

		assert_ok!(Bounties::extend_bounty_expiry(Origin::signed(4), 0, Vec::new()));

		assert_eq!(Bounties::bounties(0).unwrap(), Bounty {
			proposer: 0,
			fee: 10,
			curator_deposit: 5,
			value: 50,
			bond: 85,
			status: BountyStatus::Active { curator: 4, update_due: 30 }, // still the same
		});

		System::set_block_number(25);
		<Treasury as OnInitialize<u64>>::on_initialize(25);

		assert_noop!(Bounties::unassign_curator(Origin::signed(0), 0), Error::<Test>::Premature);
		assert_ok!(Bounties::unassign_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 10); // not slashed
		assert_eq!(Balances::reserved_balance(4), 0);
	});
}

#[test]
fn genesis_funding_works() {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	let initial_funding = 100;
	pallet_balances::GenesisConfig::<Test>{
		// Total issuance will be 200 with treasury account initialized with 100.
		balances: vec![(0, 100), (Treasury::account_id(), initial_funding)],
	}.assimilate_storage(&mut t).unwrap();
	pallet_treasury::GenesisConfig::default().assimilate_storage::<Test, _>(&mut t).unwrap();
	let mut t: sp_io::TestExternalities = t.into();

	t.execute_with(|| {
		assert_eq!(Balances::free_balance(Treasury::account_id()), initial_funding);
		assert_eq!(Treasury::pot(), initial_funding - Balances::minimum_balance());
	});
}
